[exporter/prometheus] Make the exporter not mutating

[dmitryax]

by removing an unnecessary Sort method.

This is also one of the prerequisites for open-telemetry/opentelemetry-collector#6660

[runforesight]

Foresight Summary

    
Major Impacts

build-and-test-windows duration(4 seconds) has decreased 33 minutes 8 seconds compared to main branch avg(33 minutes 12 seconds).

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⭕  build-and-test-windows workflow has finished in 4 seconds (33 minutes 8 seconds less than main branch avg.) and finished at 1st Dec, 2022.

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Job	Failed Steps	Tests
windows-unittest	-     🔗	N/A	See Details
windows-unittest-matrix	-     🔗	N/A	See Details

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✅  check-links workflow has finished in 38 seconds (1 minute 32 seconds less than main branch avg.) and finished at 1st Dec, 2022.

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Job	Failed Steps	Tests
changed files	-     🔗	N/A	See Details
check-links	-     🔗	N/A	See Details

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⭕  changelog workflow has finished in 3 seconds (4 minutes 59 seconds less than main branch avg.) and finished at 1st Dec, 2022.

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Job	Failed Steps	Tests
changelog	-     🔗	N/A	See Details

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✅  tracegen workflow has finished in 59 seconds (1 minute 24 seconds less than main branch avg.) and finished at 1st Dec, 2022.

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Job	Failed Steps	Tests
build-dev	-     🔗	N/A	See Details
publish-latest	-     🔗	N/A	See Details
publish-stable	-     🔗	N/A	See Details

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✅  prometheus-compliance-tests workflow has finished in 3 minutes 15 seconds (4 minutes 56 seconds less than main branch avg.) and finished at 1st Dec, 2022.

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Job	Failed Steps	Tests
prometheus-compliance-tests	-     🔗	✅ 21  ❌ 0  ⏭ 0    🔗	See Details

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✅  build-and-test workflow has finished in 39 minutes 21 seconds (15 minutes 9 seconds less than main branch avg.) and finished at 2nd Dec, 2022.

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Job	Failed Steps	Tests
unittest-matrix (1.18, internal)	-     🔗	✅ 591  ❌ 0  ⏭ 0    🔗	See Details
correctness-metrics	-     🔗	✅ 0  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, processor)	-     🔗	✅ 1465  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, processor)	-     🔗	✅ 1465  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, extension)	-     🔗	✅ 525  ❌ 0  ⏭ 0    🔗	See Details
correctness-traces	-     🔗	✅ 0  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, receiver-0)	-     🔗	✅ 2528  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-0)	-     🔗	✅ 2528  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, internal)	-     🔗	✅ 591  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, exporter)	-     🔗	✅ 2411  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, exporter)	-     🔗	✅ 2411  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, extension)	-     🔗	✅ 525  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, other)	-     🔗	✅ 4345  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, receiver-1)	-     🔗	✅ 1832  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, other)	-     🔗	✅ 4336  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-1)	-     🔗	✅ 1832  ❌ 0  ⏭ 0    🔗	See Details
integration-tests	-     🔗	✅ 59  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details
checks	-     🔗	N/A	See Details
lint-matrix (receiver-0)	-     🔗	N/A	See Details
lint-matrix (receiver-1)	-     🔗	N/A	See Details
lint-matrix (processor)	-     🔗	N/A	See Details
lint-matrix (exporter)	-     🔗	N/A	See Details
lint-matrix (extension)	-     🔗	N/A	See Details
lint-matrix (internal)	-     🔗	N/A	See Details
lint-matrix (other)	-     🔗	N/A	See Details
check-codeowners	-     🔗	N/A	See Details
check-collector-module-version	-     🔗	N/A	See Details
build-examples	-     🔗	N/A	See Details
lint	-     🔗	N/A	See Details
unittest (1.19)	-     🔗	N/A	See Details
unittest (1.18)	-     🔗	N/A	See Details
cross-compile (darwin, amd64)	-     🔗	N/A	See Details
cross-compile (darwin, arm64)	-     🔗	N/A	See Details
cross-compile (linux, 386)	-     🔗	N/A	See Details
cross-compile (linux, amd64)	-     🔗	N/A	See Details
cross-compile (linux, arm)	-     🔗	N/A	See Details
cross-compile (linux, arm64)	-     🔗	N/A	See Details
cross-compile (linux, ppc64le)	-     🔗	N/A	See Details
cross-compile (windows, 386)	-     🔗	N/A	See Details
cross-compile (windows, amd64)	-     🔗	N/A	See Details
build-package (deb)	-     🔗	N/A	See Details
build-package (rpm)	-     🔗	N/A	See Details
windows-msi	-     🔗	N/A	See Details
publish-check	-     🔗	N/A	See Details
publish-dev	-     🔗	N/A	See Details
publish-stable	-     🔗	N/A	See Details

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✅  load-tests workflow has finished in 8 minutes 11 seconds (6 minutes 1 second less than main branch avg.) and finished at 1st Dec, 2022.

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Job	Failed Steps	Tests
loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetric10kDPS	TestMetricsFromFile)	-     🔗	✅ 6  ❌ 0  ⏭ 0    🔗
loadtest (TestTraceNoBackend10kSPS	TestTrace1kSPSWithAttrs)	-     🔗	✅ 8  ❌ 0  ⏭ 0    🔗
loadtest (TestMetricResourceProcessor	TestTrace10kSPS)	-     🔗	✅ 12  ❌ 0  ⏭ 0    🔗
loadtest (TestTraceBallast1kSPSWithAttrs	TestTraceBallast1kSPSAddAttrs)	-     🔗	✅ 10  ❌ 0  ⏭ 0    🔗
loadtest (TestBallastMemory	TestLog10kDPS)	-     🔗	✅ 19  ❌ 0  ⏭ 0    🔗
setup-environment	-     🔗	N/A	See Details

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